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6.The news is exciting. 7.It is necessary that we go to help him. 8.With the help of Xiao Wang,they finished the work on time. 归纳:可以充当句子主语的有:
答案:The news
答案:that we go to help him
答案:they
答案:代词、动词不定式、动词-ing(短语)、句子和名词